Title :
Adaptive transform coding via quadtree-based variable blocksize DCT
Author_Institution :
Bell Commun. Res. Inc., Morristown, NJ, USA
Abstract :
An adaptive transform coding algorithm using a quadtree-based variable blocksize DCT (discrete cosine transform) is introduced to achieve a better tradeoff between bit rate and image quality. The choice of appropriate blocksize is determined by a mean-based decision rule that can discriminate various image contents for better visual quality. Some simulation results are given. It is found that the same or better image quality can be obtained with lower average bit rate
Keywords :
data compression; encoding; picture processing; transforms; adaptive transform coding algorithm; bit rate; discrete cosine transform; image coding; image quality; mean-based decision rule; quadtree-based variable blocksize DCT; simulation results; visual quality; Bit rate; Data models; Decorrelation; Discrete cosine transforms; Discrete transforms; Dynamic range; Image coding; Image quality; Karhunen-Loeve transforms; Transform coding;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1989. ICASSP-89., 1989 International Conference on
Conference_Location :
Glasgow
DOI :
10.1109/ICASSP.1989.266814
